Connecting structure of front main beam and handlebar tube

Abstract

The utility model discloses a front main beam and handlebar tube connecting structure, which belongs to the technical field of tricycle connecting structures and comprises a tricycle front main beam, a tricycle handlebar tube, an upper connecting plate and a lower connecting plate, the upper connecting plate and the lower connecting plate are movably mounted on the tricycle front main beam and used for connecting the tricycle front main beam and the tricycle handlebar tube, and the tricycle handlebar tube is movably mounted on the upper connecting plate and the lower connecting plate. And the handle clamp is movably arranged on the upper and lower connecting plates and is used for fastening a tricycle handle tube on the upper and lower connecting plates. When the tricycle handlebar tube is installed, the tricycle handlebar tube can be placed in the containing grooves of the upper connecting plate, the lower connecting plate, the positioning base and the positioning supporting rods, the two ends of the tricycle handlebar tube can be supported by arranging the positioning supporting rods at the same distance on the two sides of the upper connecting plate and the two sides of the lower connecting plate, and the position of the tricycle handlebar tube is positioned. The tricycle handlebar tube can be located in the center of the upper and lower connecting plates, frequent adjustment by workers is avoided, and stability and accuracy of the tricycle handlebar tube are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of tricycle connection structures, and particularly relates to a connection structure between a front main beam and a handlebar tube. Background Art

[0002] The upper and lower connecting plates of an electric tricycle are important components in the tricycle steering system. They connect the handlebar tube and the front main beam of the vehicle body, playing a role in supporting and transmitting the steering force. They are usually made of metal materials and have sufficient strength and stiffness to withstand the forces generated during steering. Their design usually takes into account the flexibility and stability of steering to ensure the safety performance of the tricycle during driving.

[0003] In the prior art, when installing the handlebar tube of an electric tricycle, it is usually necessary to align it with the card slot at the upper and lower connecting plates for fixation. However, during the installation process, the staff needs to manually align the handlebar tube so that it is located in the middle position of the upper and lower connecting plates. However, manual positioning is likely to cause deviation in the installation position of the handlebar tube, resulting in deviation during subsequent steering use, and the driver needs to spend more effort to correct the direction. Content of the Utility Model

[0004] Aiming at the above existing technical deficiencies, the purpose of the utility model is to provide a connection structure between a front main beam and a handlebar tube to solve some or all of the problems in the above background art.

[0005] To solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A connection structure between a front main beam and a handlebar tube, comprising:

[0007] The front main beam of the tricycle and the handlebar tube of the tricycle;

[0008] The upper and lower connecting plates, which are movably installed on the front main beam of the tricycle, and the handlebar tube of the tricycle is movably installed on the upper and lower connecting plates, and is used to connect the front main beam of the tricycle and the handlebar tube of the tricycle;

[0009] The handle clamp, which is movably installed on the upper and lower connecting plates, and the handle clamp is movably sleeved on the handlebar tube of the tricycle, and is used to fasten the handlebar tube of the tricycle on the upper and lower connecting plates;

[0010] The first clamp bolt, which is threadedly installed on the handle clamp and the upper and lower connecting plates, and is used to fix the position of the handle clamp;

[0011] The positioning structure, which is arranged on the upper and lower connecting plates and is used to position the installation position of the handlebar tube of the tricycle;

[0012] Among them, the positioning structure includes a limiting structure for preventing the deviation of the installation position of the handlebar tube of the tricycle and a fastening structure for improving the connection stability of the handlebar tube of the tricycle;

[0013] An adjusting structure is arranged on the limiting structure for adjusting the position of the limiting structure;

[0014] An extrusion structure is arranged on the adjusting structure for preventing the adjusting structure from loosening.

[0015] Preferably, the limiting structure includes:

[0016] An adjusting rod and a movable rod, both of which are slidably installed on the inner wall of the upper and lower connecting plates;

[0017] Two positioning seats are respectively arranged on the adjusting rod and the movable rod;

[0018] Two positioning support rods are respectively rotatably connected to one side of the two positioning seats;

[0019] A rotating assembly is arranged on the positioning support rod for rotating and adjusting the angle of the positioning support rod;

[0020] Wherein, placing grooves adapted to the shape of the handlebar tube of the tricycle are formed on the two positioning seats, the two positioning support rods and the upper and lower connecting plates, and the distances between the two positioning support rods and the upper and lower connecting plates are the same.

[0021] Preferably, the rotating assembly includes a limiting rotating ring arranged at one end of the positioning support rod and an annular limiting groove formed on the inner wall of the positioning seat, and the limiting rotating ring is rotatably installed in the annular limiting groove for preventing loosening when the limiting rotating ring rotates.

[0022] Preferably, the fastening structure includes:

[0023] A reinforcing clamp is movably installed on the positioning support rod and the handlebar tube of the tricycle for fastening the handlebar tube of the tricycle on the positioning support rod;

[0024] A second clamp bolt is threadedly installed on the reinforcing clamp and the positioning support rod for fixing the position of the reinforcing clamp.

[0025] Preferably, the adjusting structure includes:

[0026] A connecting shaft is rotatably installed on the inner wall of the upper and lower connecting plates;

[0027] A linkage gear ring is sleeved on the connecting shaft;

[0028] A first linkage rack is arranged on the inner wall of the movable rod, and the first linkage rack meshes with the linkage gear ring;

[0029] A second linkage rack is arranged on the inner wall of the adjusting rod, and the second linkage rack meshes with the linkage gear ring;

[0030] A knob is arranged at one end of the connecting shaft for driving the connecting shaft to rotate;

[0031] The limiting component is arranged on the adjusting rod and the movable rod and is used to limit the moving directions of the adjusting rod and the movable rod;

[0032] Among them, the first linkage rack is located above the second linkage rack.

[0033] Preferably, the limiting component includes:

[0034] The first limiting block and the second limiting block are both arranged on the inner wall of the upper and lower connecting plates;

[0035] The first limiting chute is opened on the inner wall of the movable rod, and the first limiting block is slidably installed in the first limiting chute and is used to limit the moving direction of the first limiting block;

[0036] The second limiting chute is opened on the inner wall of the adjusting rod, and the second limiting block is slidably installed in the second limiting chute and is used to limit the moving direction of the second limiting block.

[0037] Preferably, the extrusion structure includes:

[0038] The limiting bolt is threadedly installed on the inner wall of the knob;

[0039] The rubber pressing block is arranged at one end of the limiting bolt;

[0040] Among them, the rubber pressing block is in contact with the surface of the upper and lower connecting plates, and the inner wall of the knob is provided with threads adapted to the limiting bolt.

[0041] The beneficial effects of the present utility model are as follows:

[0042] In the present utility model, when installing the tricycle handlebar tube, it can be placed in the placement grooves of the upper and lower connecting plates, the positioning seat and the positioning support rod. By arranging the positioning support rods with the same distance on both sides of the upper and lower connecting plates, the two ends of the tricycle handlebar tube can be supported, the position of the tricycle handlebar tube can be positioned, so that the tricycle handlebar tube can be located at the center position of the upper and lower connecting plates, avoiding frequent adjustment by the staff, ensuring the stability and accuracy of the tricycle handlebar tube. Then, the tricycle handlebar tube can be fastened to the upper and lower connecting plates by using the handle clamp and the first clamp bolt, and the two ends of the tricycle handlebar tube can be respectively fastened to the two positioning support rods by using the reinforcement clamp and the second clamp bolt, further improving the stability of the tricycle handlebar tube during installation.

[0043] In the present utility model, after the tricycle handlebar tube is placed in the positioning support rod, the installation angle can be adjusted by rotating the tricycle handlebar tube and the positioning support rod, and the positioning effect of the tricycle handlebar tube will not be affected. And by rotating the knob, the distance between the two positioning support rods can be adjusted, so that it can be adapted to the positioning use of tricycle handlebar tubes with different lengths, further improving the applicability of the structure. Description of the Drawings

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0045] Figure 1 It is a schematic structural diagram of a connection structure between a front main beam and a handlebar tube provided by an embodiment of the present invention;

[0046] Figure 2 It is a partial structural diagram of a connection structure between a front main beam and a handlebar tube provided by an embodiment of the present invention;

[0047] Figure 3 It is a schematic diagram of a knob structure of a connection structure between a front main beam and a handlebar tube provided by an embodiment of the present invention;

[0048] Figure 4 It is an exploded structural diagram of a connection structure between a front main beam and a handlebar tube provided by an embodiment of the present invention;

[0049] Figure 5 It is a schematic diagram of a structure of an adjusting rod and a movable rod of a connection structure between a front main beam and a handlebar tube provided by an embodiment of the present invention;

[0050] Figure 6 It is a schematic cross-sectional view of a knob of a connection structure between a front main beam and a handlebar tube provided by an embodiment of the present invention.

[0051] Explanation of reference numerals:

[0052] 1. Front main beam of a tricycle; 2. Handlebar tube of a tricycle; 3. Upper and lower connecting plates; 4. Handle clamp; 5. First clamp bolt; 6. Adjusting rod; 601. Movable rod; 602. Positioning seat; 603. Positioning support rod; 604. Limiting rotating ring; 605. Annular limiting groove; 606. Reinforcing clamp; 607. Second clamp bolt; 7. Connecting shaft; 701. Linkage gear ring; 702. First linkage rack; 703. Second linkage rack; 704. Knob; 705. First limiting block; 706. First limiting chute; 707. Second limiting block; 708. Second limiting chute; 8. Limiting bolt; 801. Rubber pressing block. Detailed implementation manners

[0053] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0054] Embodiment 1:

[0055] As Figures 1 to 6 shown, the present utility model provides a connection structure between a front main beam and a handlebar tube, including: a tricycle front main beam 1 and a tricycle handlebar tube 2, an upper and lower connecting plate 3 movably installed on the tricycle front main beam 1 for connecting the tricycle front main beam 1 and the tricycle handlebar tube 2, the tricycle handlebar tube 2 being movably installed on the upper and lower connecting plate 3, a handle clamp 4 movably installed on the upper and lower connecting plate 3 for fastening the tricycle handlebar tube 2 to the upper and lower connecting plate 3, the handle clamp 4 being movably sleeved on the tricycle handlebar tube 2, and a clamp bolt 1 5 threadedly installed on the handle clamp 4 and the upper and lower connecting plate 3 for fixing the position of the handle clamp 4.

[0056] In order to quickly align 2 with the center of 3 during installation, prevent 2 from shifting, and improve the stability of the installation of 2, a positioning structure for positioning the installation position of the tricycle handlebar tube 2 is arranged on the upper and lower connecting plate 3. The positioning structure includes a limiting structure for preventing the installation position of the tricycle handlebar tube 2 from shifting and a fastening structure for improving the connection stability of the tricycle handlebar tube 2.

[0057] Among them, the limiting structure includes an adjusting rod 6 and a movable rod 601 slidably installed on the inner wall of the upper and lower connecting plate 3, two positioning seats 602 respectively arranged on the adjusting rod 6 and the movable rod 601, two positioning support rods 603 respectively rotatably connected to one side of the two positioning seats 602, a rotating assembly arranged on the positioning support rod 603 for rotating and adjusting the angle of the positioning support rod 603. Placement grooves adapted to the shape of the tricycle handlebar tube 2 are opened on the two positioning seats 602, the two positioning support rods 603, and the upper and lower connecting plate 3. The distance between the two positioning support rods 603 and the upper and lower connecting plate 3 is the same. Place the tricycle handlebar tube 2 in the placement groove on the upper and lower connecting plate 3, and at the same time place both ends of the tricycle handlebar tube 2 in the placement grooves of the two positioning support rods 603 on both sides. By providing the two positioning support rods 603, the tricycle handlebar tube 2 can be supported and positioned, so that the tricycle handlebar tube 2 is located in the middle position of the upper and lower connecting plate 3.

[0058] Specifically, the rotating assembly includes a limiting rotating ring 604 arranged at one end of the positioning support rod 603 and an annular limiting groove 605 opened on the inner wall of the positioning seat 602 to prevent the limiting rotating ring 604 from loosening when rotating. The limiting rotating ring 604 is rotatably installed in the annular limiting groove 605. By rotating the tricycle handlebar tube 2 and the positioning support rod 603, the tricycle handlebar tube 2 can rotate in the placement grooves of the upper and lower connecting plates 3 and the positioning seat 602. At the same time, the positioning support rod 603 drives the limiting rotating ring 604 to rotate in the annular limiting groove 605 on the positioning seat 602, so as to adjust the angle of the tricycle handlebar tube 2.

[0059] Among them, the fastening structure includes a reinforcing clamp 606 movably installed on the positioning support rod 603 and the tricycle handlebar tube 2 for fastening the tricycle handlebar tube 2 to the positioning support rod 603, and a second clamp bolt 607 threadedly installed on the reinforcing clamp 606 and the positioning support rod 603 for fixing the position of the reinforcing clamp 606. The reinforcing clamp 606 can be sleeved on the tricycle handlebar tube 2 and fitted with the positioning support rod 603. Then, the second clamp bolt 607 is screwed into the positioning support rod 603 and the reinforcing clamp 606 for fixation, and the two ends of the tricycle handlebar tube 2 are pressed again, so as to reinforce the connection of the tricycle handlebar tube 2.

[0060] Embodiment 2:

[0061] On the basis of Embodiment 1, in order to adjust the spacing of the limiting structure according to the size of 2 so as to be applicable to 2 with different lengths for installation and use, an adjusting structure for adjusting the position of the limiting structure is arranged on the limiting structure, and an extrusion structure for preventing the adjusting structure from loosening is arranged on the adjusting structure.

[0062] Among them, the adjusting structure includes a connecting shaft 7 rotatably installed on the inner wall of the upper and lower connecting plates 3, a linkage gear ring 701 sleeved on the connecting shaft 7, a first linkage rack 702 arranged on the inner wall of the movable rod 601, the first linkage rack 702 meshing with the linkage gear ring 701, a second linkage rack 703 arranged on the inner wall of the adjusting rod 6, the second linkage rack 703 meshing with the linkage gear ring 701, the first linkage rack 702 being located above the second linkage rack 703, a knob 704 arranged at one end of the connecting shaft 7 for driving the connecting shaft 7 to rotate, and a limiting component arranged on the adjusting rod 6 and the movable rod 601 for limiting the moving directions of the adjusting rod 6 and the movable rod 601. Rotating the knob 704 drives the connecting shaft 7 to rotate. When the connecting shaft 7 rotates, it can drive the adjusting rod 6 and the movable rod 601 to move away from or close to each other, so as to adjust the spacing between the positioning seat 602 and the positioning support rod 603.

[0063] Specifically, the limiting component includes a first limiting block 705 and a second limiting block 707 arranged on the inner wall of the upper and lower connecting plates 3, a first limiting chute 706 opened on the inner wall of the movable rod 601 for restricting the moving direction of the first limiting block 705, the first limiting block 705 is slidably installed in the first limiting chute 706, a second limiting chute 708 opened on the inner wall of the adjusting rod 6 for restricting the moving direction of the second limiting block 707, the second limiting block 707 is slidably installed in the second limiting chute 708, when the adjusting rod 6 moves, it can slide on the second limiting block 707 through the second limiting chute 708, and when the movable rod 601 moves, it can slide on the first limiting block 705 through the first limiting chute 706, thereby preventing the adjusting rod 6 and the movable rod 601 from disengaging from the upper and lower connecting plates 3.

[0064] Among them, the extrusion structure includes a limiting bolt 8 threadedly installed on the inner wall of the knob 704, a rubber pressing block 801 arranged at one end of the limiting bolt 8, the rubber pressing block 801 is in contact with the surface of the upper and lower connecting plates 3, the inner wall of the knob 704 is provided with a thread adapted to the limiting bolt 8, rotating the limiting bolt 8 can make it move through the thread cooperation with the knob 704, thereby driving the rubber pressing block 801 to disengage from the extrusion of the surface of the upper and lower connecting plates 3, and when rotating the limiting bolt 8 in the reverse direction, it can drive the rubber pressing block 801 to press on the surface of the upper and lower connecting plates 3 again.

[0065] Working principle:

[0066] When the tricycle handlebar tube 2 needs to be installed at the upper and lower connecting plates 3 on the front main beam 1 of the tricycle, the tricycle handlebar tube 2 can be placed in the placement groove on the upper and lower connecting plates 3, and at the same time, both ends of the tricycle handlebar tube 2 are respectively placed in the placement grooves of the two positioning support rods 603. By setting the two positioning support rods 603, the tricycle handlebar tube 2 can be supported and positioned, so that the tricycle handlebar tube 2 is located in the middle of the upper and lower connecting plates 3. And by rotating the tricycle handlebar tube 2 and the positioning support rods 603, the tricycle handlebar tube 2 can rotate in the placement grooves of the upper and lower connecting plates 3 and the positioning seat 602, and at the same time, the positioning support rods 603 drive the limiting rotating ring 604 to rotate in the annular limiting groove 605 on the positioning seat 602, thereby enabling the angle of the tricycle handlebar tube 2 to be adjusted. The annular limiting groove 605 is designed in a ring shape, so that the positioning effect on the tricycle handlebar tube 2 will not be affected during rotation. After adjustment, the handle clamp 4 can be sleeved on the tricycle handlebar tube 2 and fitted with the upper and lower connecting plates 3, and then the first clamp bolt 5 is screwed into the upper and lower connecting plates 3 and the handle clamp 4 to press and fasten the tricycle handlebar tube 2. Then, the reinforcing clamp 606 can be sleeved on the tricycle handlebar tube 2 and fitted with the positioning support rods 603, and the second clamp bolt 607 is screwed into the positioning support rods 603 and the reinforcing clamp 606 for fixation, and the two ends of the tricycle handlebar tube 2 are pressed again, which can reinforce the connection of the tricycle handlebar tube 2 and prevent the tricycle handlebar tube 2 from shifting.

[0067] By rotating the limit bolt 8, it can move through the threaded fit with the knob 704, so that the rotating and moving limit bolt 8 drives the rubber pressing block 801 to disengage from the extrusion of the surface of the upper and lower connecting plates 3. At this time, the restriction on the knob 704 can be released, and then the knob 704 is rotated to drive the connecting shaft 7 to rotate. When the connecting shaft 7 rotates, it can drive the linkage gear ring 701 to rotate. Through the meshing arrangement of the linkage gear ring 701 with the first linkage rack 702 and the second linkage rack 703, and the positions of the first linkage rack 702 and the second linkage rack 703 are opposite, so that when the linkage gear ring 701 rotates, it can drive the adjusting rod 6 and the movable rod 601 to move away from or close to each other at the same time. When the adjusting rod 6 moves, it can slide on the second limiting block 707 through the second limiting chute 708, and when the movable rod 601 moves, it can slide on the first limiting block 705 through the first limiting chute 706, thus preventing the adjusting rod 6 and the movable rod 601 from disengaging from the upper and lower connecting plates 3. The continuously moving adjusting rod 6 and movable rod 601 can drive the corresponding positioning seat 602 and positioning support rod 603 to move respectively, and then the distance between the positioning seat 602 and the positioning support rod 603 can be adjusted, so as to adjust the positions of the two positioning support rods 603 according to the length of the tricycle handlebar tube 2 to be installed. After adjustment, the limit bolt 8 is rotated in the reverse direction to drive the rubber pressing block 801 to press on the surface of the upper and lower connecting plates 3 again, so as to restrict the knob 704 again, and then restrict the position of the positioning support rod 603.

[0068] Obviously, those skilled in the art can make various changes and modifications to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and their equivalent technologies, the present utility model also intends to include these changes and modifications.

Claims

1. A connecting structure between a front main beam and a handlebar tube, characterized in that, Comprising: The front main beam (1) of a tricycle and the handlebar tube (2) of a tricycle; The upper and lower connecting plates (3), which are movably installed on the front main beam (1) of the tricycle, and the handlebar tube (2) of the tricycle is movably installed on the upper and lower connecting plates (3) for connecting the front main beam (1) of the tricycle and the handlebar tube (2); The handle clamp (4), which is movably installed on the upper and lower connecting plates (3), and the handle clamp (4) is movably sleeved on the handlebar tube (2) of the tricycle for fastening the handlebar tube (2) of the tricycle on the upper and lower connecting plates (3); The first clamp bolt (5), which is threadedly installed on the handle clamp (4) and the upper and lower connecting plates (3) for fixing the position of the handle clamp (4); The positioning structure, which is arranged on the upper and lower connecting plates (3) for positioning the installation position of the handlebar tube (2) of the tricycle; Wherein, the positioning structure includes a limiting structure for preventing the installation position of the handlebar tube (2) of the tricycle from shifting and a fastening structure for improving the connection stability of the handlebar tube (2) of the tricycle; The limiting structure is provided with an adjusting structure for adjusting the position of the limiting structure, and the adjusting structure is further provided with a pressing structure for preventing the adjusting structure from loosening.

2. The connecting structure between the front main beam and the handlebar tube according to claim 1, wherein, The limiting structure includes: The adjusting rod (6) and the movable rod (601), both of which are slidably installed on the inner wall of the upper and lower connecting plates (3); Two positioning seats (602), which are respectively arranged on the adjusting rod (6) and the movable rod (601); Two positioning support rods (603), which are respectively rotatably connected to one side of the two positioning seats (602); The rotating assembly, which is arranged on the positioning support rod (603) for rotating and adjusting the angle of the positioning support rod (603); Wherein, the two positioning seats (602), the two positioning support rods (603) and the upper and lower connecting plates (3) are all provided with placing grooves adapted to the shape of the handlebar tube (2) of the tricycle, and the distance between the two positioning support rods (603) and the upper and lower connecting plates (3) is the same.

3. The connection structure between the front main beam and the handlebar tube according to claim 2, characterized in that, The rotating assembly includes a limiting rotating ring (604) arranged at one end of the positioning support rod (603) and an annular limiting groove (605) opened on the inner wall of the positioning seat (602), and the limiting rotating ring (604) is rotatably installed in the annular limiting groove (605) for preventing the limiting rotating ring (604) from loosening when rotating.

4. The connection structure between the front main beam and the handlebar tube according to claim 1, characterized in that, The fastening structure includes: The reinforcing clamp (606), which is movably installed on the positioning support rod (603) and the handlebar tube (2) of the tricycle for fastening the handlebar tube (2) of the tricycle on the positioning support rod (603); The second clamp bolt (607), which is threadedly installed on the reinforcing clamp (606) and the positioning support rod (603) for fixing the position of the reinforcing clamp (606).

5. The connecting structure between the front main beam and the handlebar tube according to claim 1, characterized in that, The adjusting structure includes: The connecting shaft (7), which is rotatably installed on the inner wall of the upper and lower connecting plates (3); The linkage gear ring (701), which is sleeved on the connecting shaft (7); The first linkage rack (702), which is arranged on the inner wall of the movable rod (601), and the first linkage rack (702) meshes with the linkage gear ring (701); The second linkage rack (703), which is arranged on the inner wall of the adjusting rod (6), and the second linkage rack (703) meshes with the linkage gear ring (701); A knob (704) is arranged at one end of the connecting shaft (7) and is used to drive the connecting shaft (7) to rotate; A limit assembly is arranged on the adjusting rod (6) and the movable rod (601) and is used to limit the moving directions of the adjusting rod (6) and the movable rod (601); Wherein, the first linkage rack (702) is located above the second linkage rack (703).

6. The connection structure between the front main beam and the handlebar tube according to claim 5, characterized in that, The limit assembly includes: A first limit block (705) and a second limit block (707), both arranged on the inner wall of the upper and lower connecting plate (3); A first limit sliding groove (706) is opened on the inner wall of the movable rod (601), and the first limit block (705) is slidably installed in the first limit sliding groove (706) and is used to limit the moving direction of the first limit block (705); A second limit sliding groove (708) is opened on the inner wall of the adjusting rod (6), and the second limit block (707) is slidably installed in the second limit sliding groove (708) and is used to limit the moving direction of the second limit block (707).

7. The connection structure between the front main beam and the handlebar tube according to claim 1, wherein, The extrusion structure includes: A limit bolt (8) is threadedly installed on the inner wall of the knob (704); A rubber pressing block (801) is arranged at one end of the limit bolt (8); Wherein, the rubber pressing block (801) is in contact with the surface of the upper and lower connecting plate (3), and a thread adapted to the limit bolt (8) is opened on the inner wall of the knob (704).

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